Using the Tracy dataset to make a GIS map does not yield a particularly interesting visualization. We don't need a map to tell us that the majority of books were published in London -- but here's a map anyway.
(I thought about trying to map the settings of each work in the corpus - a lot of them seemed to be set in Italy, Spain, and Southern France - but that would require reading all 208 works and creating a whole other data set, so... that'll have to wait.)
On the other hand, if we narrow down our existing dataset to feature only publishers in London, and then try to plot them on a city map, we might have a more interesting visual.
In order to find the locations of these publishers, I searched online for scanned or transcribed copies of original editions - the title pages of these books conventionally had the publisher's name, the street on which they were located (if not the numerical address), and the city. Based on what I could find, I added pins to a Google map to approximate those locations. Finally, I transferred my estimated coordinates over to a Tableau map so that I could make each point reflect the number of works published at a given location.
HOWEVER.
It should be stated that the margin of error here is extremely high. Many of the publishers did not have a numerical street address, requiring me to guess or place a pin in the middle of the street. Some title pages listed two streets that did not appear to be in the same part of town; not being sure if they were originally cross-streets or two separate locations, I ultimately chose to place a pin on whichever street was closest to the other points on the map. (I assumed that an area with more pins would naturally have more publishing houses, like a publishing district.)
Additionally, a modern map of London does not necessarily reflect what London looked like 300 years ago. Paternoster Row, a major hub for publishers near St. Paul's Cathedral, was destroyed during the Blitz in World War II. While the street still exists, the original buildings no longer there. However, Locating London has a neat map of historic London that shows what the city looked like in 1746. (While I can't plot the publisher data points on that map, there's plenty of other data filters that can be explored on their site.)